What is coronavirus ?
Coronaviruses are a group of related viruses that cause diseases in mammals and birds. In humans, coronaviruses cause respiratory tract infections that can range from mild to lethal. Mild illnesses include some cases of the common cold. While more lethal varieties can cause SARS, MERS, and COVID-19.
What is Coronavirus Disease?
Coronavirus disease 2019 (COVID-19) is an infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The disease was first identified in December 2019 in Wuhan, and has since spread globally. This has resulted in the ongoing 2019–20 coronavirus pandemic. Common symptoms include fever, cough, and shortness of breath. Other symptoms may include fatigue, muscle pain, diarrhoea, sore throat, loss of smell, and abdominal pain. The time from exposure to onset of symptoms is typically around five days. But it may range from two to fourteen days. While the majority of cases result in mild symptoms, some progress to viral pneumonia and multi-organ failure.
How did COVID-19 begin?
An investigation was launched in early January 2020 as health authorities in Wuhan, Hubei, China, reported a cluster of viral pneumonia cases of unknown cause on 31 December 2019, . The virus has a zoonotic origin because the cases mostly had links to the Huanan Seafood Wholesale Market . SARS-CoV-2, a newly discovered virus closely related to bat coronaviruses, pangolin coronaviruses, and SARS-CoV is the virus that caused the outbreak.
In March and April 2020, scientists reported that the virus originated naturally.
The earliest known person with symptoms was later discovered to have fallen ill on 1 December 2019, and that person did not have visible connections with the wet market cluster. But two-thirds of the early cluster of cases reported in December 2019 had a link with the market. On 13 March 2020, an unverified report from the South China Morning Post suggested a case traced back to 17 November 2019, in a 55-year-old from Hubei, may have been the first.
The number of cases doubled approximately every seven and a half days during the early stages of the outbreak. As Wuhan is a transport hub and major rail interchange and due to the Chinese New Year migration in early and mid-January 2020, the virus spread to other Chinese provinces, . On 20 January, China reported nearly 140 new cases in one day, including two people in Beijing and one in Shenzhen. Later official data shows that 6,174 people had already developed symptoms by 20 January 2020.
The United States had overtaken China and Italy with the highest number of confirmed cases in the world by march 26. Research on coronavirus genomes indicates the majority of COVID-19 cases in New York came from European travelers, rather than directly from China or any other Asian country.
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